Using references and global in php

In php, the parameters in the function are passed by value. For example:

<?php
	$a = 12;
	function f($a) {
		$a += 10;
		
	}
	f($a);
	echo $a;
?>

The output result is 12.

If you want to change it to pass by reference, then you only need to change the function body and use Reference symbol &:

function f(<span style="color:#FF0000;">&</span>$a) {
		$a += 10;
		
	}

Another way is to change $a into a global variable in the function body, using the global keyword:

function f($a) {
		global $a;
		$a += 10;
		
	}

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The above introduces the use of references and global in PHP, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.